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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
It's not so much a question of what bacterial vaginosis looks like as what bacterial vaginosis smells like. Women with BV tend to have vaginal discharge with a fishy odor. This odor is more pronounced after unprotected sex because the compounds that cause the odor smell more strongly at higher pH. When semen enters the vagina, it raises the pH to nearly 7 for a period of several hours. This is why many people think BV is caused by sperm.